A027306 - cp's OEIS frontend

A027306 a(n) = 2^(n-1) + ((1 + (-1)^n)/4)*binomial(n, n/2).

n	a(n)
0	1
1	1
2	3
3	4
4	11
5	16
6	42
7	64
8	163
9	256
10	638
11	1024
12	2510
13	4096
14	9908
15	16384
16	39203
17	65536
18	155382
19	262144
20	616666
21	1048576
22	2449868
23	4194304
24	9740686
25	16777216
26	38754732
27	67108864
28	154276028
29	268435456
30	614429672
31	1073741824
32	2448023843

[1, 1, 3, 4, 11, 16, 42, 64, 163, 256, 638, 1024, 2510, 4096, 9908, 16384, 39203, 65536, 155382, 262144, 616666, 1048576, 2449868, 4194304, 9740686, 16777216, 38754732, 67108864, 154276028, 268435456, 614429672, 1073741824, 2448023843]

cp's OEIS Frontend

A027306 a(n) = 2^(n-1) + ((1 + (-1)^n)/4)*binomial(n, n/2).

Table of values

List of values